Description
Overview:
This 0.25 mm oversize piston is a direct replacement for Robin/Subaru DY23 and DY27 industrial engines, referenced by OEM No. 244-23402-13. Made from durable cast aluminium alloy for low weight and effective heat dissipation, it restores correct clearances after a cylinder rebore, helping to recover compression, power and starting performance. The piston features precision-machined ring lands and a gudgeon pin bore to maintain a stable combustion seal and smooth operation under sustained load. It is suitable for engines commonly found in construction and garden machinery such as compactors, generators and pumps. Use this component during an engine overhaul when the cylinder has been re-bored by 0.25 mm to bring the engine back within specification and extend service life.
Key Features:
- 0.25 mm oversize to suit re-bored cylinders, restoring correct piston-to-bore clearance
- Aluminium alloy construction for strength, light weight and efficient heat transfer
- Precision-machined crown, skirt and ring grooves for reliable sealing and reduced blow-by
- Designed for a straightforward fit in DY23 and DY27 engines with standard workshop tools
- Maintains compatibility with the original connecting rod and gudgeon pin used in these engines
- Helps reduce oil consumption and exhaust smoke by improving oil control
- Stable performance under heavy-duty site use and frequent start/stop cycles
- OEM reference 244-23402-13 for accurate identification and parts matching
Typical Applications:
Used during engine rebuilds or major services on small industrial equipment, including plate compactors, generators, water pumps, cement mixers and turf machinery. Ideal when bores are worn and have been re-bored by 0.25 mm to bring the engine back to reliable daily operation.
Also known as:
DY23/DY27 0.25 mm oversize piston, Subaru Robin DY-series piston 0.25 OS, engine piston for DY-series industrial engines, overbore piston for Robin/Subaru small engine, replacement piston for DY23/DY27 rebuilds.
Fits Models:
DY23, DY27
Alternate Part Numbers:
244-23402-13, 2442340213
Product Specifications
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
